[UE4]C++实现动态加载UObject：StaticLoadObject()；以Texture和Material为例

相关内容：

C++实现动态加载的问题：LoadClass<T>()和LoadObject<T>()

http://aigo.iteye.com/blog/2281558
C++静态加载问题：ConstructorHelpers::FClassFinder()和FObjectFinder() 

http://aigo.iteye.com/blog/2281373

示例1：

动态加载Object的工具方法

UTexture2D* MyTextureLoader::LoadTextureFromPath(const FString& Path)
{
    if (Path.IsEmpty()) return NULL;  

    return Cast<UTexture2D>(StaticLoadObject(UTexture2D::StaticClass(), NULL, *(Path)));
}  

调用：

FString PathToLoad = "/Game/Textures/YourStructureHere";
UTexture2D* tmpTexture = LoadTextureFromPath(PathToLoad);  

示例2：
加载Material和Texture

struct FConstructorStatics
 {
     ConstructorHelpers::FObjectFinderOptional<UTexture> TextureFinder;
     ConstructorHelpers::FObjectFinderOptional<UMaterial> MaterialFinder;
     FConstructorStatics()
         : TextureFinder(TEXT("Texture2D'/Game/Textures/2DBackground.2DBackground'"))
         , MaterialFinder(TEXT("Material'/Game/Materials/DynamicTextureMaterial.DynamicTextureMaterial'"))
     {
     }
 };
 static FConstructorStatics ConstructorStatics;  

 Texture = ConstructorStatics.TextureFinder.Get();
 UMaterial* Material = ConstructorStatics.MaterialFinder.Get();
 DynamicMaterial = UMaterialInstanceDynamic::Create(Material, this);  

设置调用加载好的Material和Texture：

DynamicMaterial->SetTextureParameterValue(FName("DynamicTexture"), Texture);
Mesh->SetMaterial(, DynamicMaterial);  

如果资源永不再使用，想销毁资源对象，代码如下：

Texture2D* mytex; //这里假设mytex合法有效  

mytex->ConditionalBeginDestroy();
mytex = NULL;
GetWorld()->ForceGarbageCollection(true);  

Dynamic Asset Loading with C++

https://www.youtube.com/watch?v=pJIAmSGxfmQ

Dynamic Load Object

https://wiki.unrealengine.com/Dynamic_Load_Object